College of Landscape Architecture, Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China.
College of Landscape Architecture, Co-Innovation Center for Sustainable Forestry in Southern China, College of Art and Design, Nanjing Forestry University, Nanjing, 210037, China.
Sci Rep. 2021 May 4;11(1):9500. doi: 10.1038/s41598-021-84702-y.
Carpinus betulus and Carpinus putoensis are precious species in the world. Studies on the ecosystem function of the two species are rare. This study investigated the physiological and biochemical responses of C. betulus and C. putoensis to NO stress and their natural recovery. C. betulus and C. putoensis seedlings underwent fumigation with 12.0 mg/m NO for 0, 1, 6, 12, 24, 48, and 72 h, respectively. Then, the plants were allowed to recover at room temperature for 30 d. Physiological and biochemical changes in the leaves were compared between the two species. In terms of peroxidase (POD) activity, the damage response of C. betulus under NO stress appeared later than that of C. putoensis. The soluble protein content of C. betulus was noticeably higher than that of C. putoensis, and C. betulus exhibited more stable membrane lipoperoxidation. The tendency of the changes in nitrate reductase of C. betulus was less noticeable than that of C. putoensis. The variation amplitudes of N, K, Mg, Zn and Mn in the leaves of C. putoensis were greater than those of C. betulus. C. putoensis showed more sensitive metabolisms in response to NO stress compared with C. betulus. High-concentration NO caused damage to C. betulus and C. putoensis was reversible, and both species returned to normal growth via their own metabolism after 30-d recovery. The results of this study may provide useful reference data for quantitative assessment of the ecosystem function of C. betulus and C. putoensis and for their scientific application in urban greening.
欧洲水青冈和油桐是世界珍稀树种，有关这两个树种的生态系统功能研究较少。本研究探讨了欧洲水青冈和油桐幼苗对 NO 胁迫的生理生化响应及其自然恢复能力。欧洲水青冈和油桐幼苗分别在 12.0 mg/m 的 NO 下熏气 0、1、6、12、24、48 和 72 h，然后在室温下恢复 30 d。比较了两种树种叶片的生理生化变化。在过氧化物酶（POD）活性方面，NO 胁迫下欧洲水青冈的损伤反应比油桐晚。欧洲水青冈的可溶性蛋白含量明显高于油桐，且膜脂过氧化更稳定。欧洲水青冈硝酸还原酶的变化趋势不如油桐明显。油桐叶片中 N、K、Mg、Zn 和 Mn 的变化幅度大于欧洲水青冈。与欧洲水青冈相比，油桐对 NO 胁迫的代谢更为敏感。高浓度 NO 对欧洲水青冈和油桐造成的损害是可逆的，两种树种在 30 d 的恢复后通过自身代谢恢复正常生长。本研究结果可为定量评估欧洲水青冈和油桐的生态系统功能及其在城市绿化中的科学应用提供有价值的参考数据。
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